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Technical Articles

  • Maintenance on Fire Pump and Arc-Flash Hazards

    Don’t Open Energized Controllers We’ve probably all heard or used the old adage, “What you don’t know won’t hurt you,” when referring to things that o…

  • NFPA 25, 2017 Edition

    What’s New? If you read this magazine, then you already know the 2017 edition of NFPA 25, Standard for the Inspection, Testing, and Maintenance of Wat…

  • changes in 2016 nfpa 13

    Modifiers to the Water Supply Data

    Who is Responsible for What? Everyone knows that a water supply test is simply a snapshot of what is available at that moment in time. We also know th…

  • Conducting Flow Tests

    Look to NFPA Standards for Recommended Practices Industry and nationwide hydrant flow tests can vary greatly. Most people don’t know the National Fire…

  • OSHA’s Silica in Construction Standard

    Concerns for Fire Sprinkler Installers On March 25, 2016, the Occupational Safety and Health Administration (OSHA) published its final rule on respira…

NFPA 25, 2017 Edition

What’s New? If you read this magazine, then you already know the 2017 edition of NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, was ready for adoption last year. You may even know whether your jurisdiction has adopted it or not. Yes, three years …

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Conducting Flow Tests

Look to NFPA Standards for Recommended Practices Industry and nationwide hydrant flow tests can vary greatly. Most people don’t know the National Fire Protection Association (NFPA) has a “recommended practice” for conducting a flow test: NFPA 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants. The 2017 edition …

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Understanding the Darcy-Weisbach Equation

When Not to Use Hazen-Williams Any seasoned fire sprinkler designer or fire protection engineer should be familiar with the Hazen-Williams equation. It is the fundamental equation used in water-based fire protection for calculating the friction loss of water flowing through pipe. The Hazen-Williams formula (see Figure 1) is used when …

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Hydraulic Calculations

Back to Basics Hydraulic calculations completed by hand are a thing of the past. Computer programs can provide you with pages of information at the click of a mouse. However, given the demand for new sprinkler designers, there is a need to return to the basics. Designers, particularly newer designers, …

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Longitudinal Sway Bracing of CPVC

Using an NFPA 13 Analogy There are very few listed sway brace fittings for CPVC pipe. Listing criteria specified by the CPVC resin manufacturers and recognized by Underwriters Laboratories (UL) define the mechanics required of listed CPVC sway brace fittings and their design. Accordingly, UL listing requires strictly defined features …

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